Algebra practice question

Answer: 3

On the x-axis, y = 0: 5x − 15 = 0, so 5x = 15 and x = 3.

Common wrong answers

If you answered 15

15 is 5x, one step short; divide by 5.

If you answered -15

−15 is the y-intercept — where the line crosses the y-axis, not the x-axis.

If you answered -3

−3 has the wrong sign: 5x = 15 gives x = 3.

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